Go over to www.jouster.com and check their "Smallbore Forum". There's a guy(his name is Douglas) over there who will have a production run made when he gets enough interest. Usually 30 people is what it takes.

No drilling & tapping required. You just remove the rear sight & the scope mount uses the existing holes where the rear sight goes.

BTW- Really cool little rifles, aren't they? I only got one before CMP ran out. Wish I had gotten a couple more when you could still get them for under $100 to your door...